Acknowledgments. This study was carried in the framework of the interdisciplinary research program "Stability of Rainforest Margins in Indonesia" (STORMA) funded by the German Research Foundation (DFG-SFB 552, grant to SRG). We gratefully acknowledge the support from STORMA's Indonesian partner universities in Bogor and Palu, Institut Pertanian Bogor (IPB) and Universitas Tadulako (UNTAD), the Ministry of Education in Jakarta (DIKTI), the authorities of Lore Lindu National Park "Balai Taman Nasional Lore Lindu", our Indonesian counterparts Dr. S. Tjitrosoedirdjo (SEAMEO-BIOTROP) and Dr. J. Mogea (Herbarium Bogoriense), and STORMA's coordinating teams in Göttingen, Bogor and Palu. We also express our cordial thanks to the director of the Herbarium Celebense (UNTAD, Palu), Dr. Ramadhanil Pitopang and his staff for their generous help and to Drs Michael Kessler and Jochen Heinrichs (Göttingen) for constructive comments on the manuscript.